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Texas Instruments UCD74111RVFT
- Part No.:
- UCD74111RVFT
- Manufacturer:
- Texas Instruments
- Package:
- 40-PowerLFQFN
- Datasheet:
-
UCD74111RVFT.pdf
- Description:
- IC REG BUCK 15A 40LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:668
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Product details
Overview
UCD74111RVFT from Texas Instruments is a high-current synchronous buck power stage integrating dual NexFET™ MOSFETs and gate drivers in a single 40-pin PQFN package. It delivers 15-A continuous output current, operates from 4.7 V to 14 V input, supports up to 2 MHz switching frequency, and features DCR-based current sensing with IMON output for real-time load monitoring-ideal for powering DSPs and ASICs in telecom POL applications.
For engineers reviewing the UCD74111RVFT datasheet, UCD74111RVFT pinout, UCD74111RVFT application, or UCD74111RVFT equivalent, key selection considerations include its integrated thermal shutdown, tri-state PWM input for power stage shutdown, high-side current protection with blanking delay control via RDLY, and compatibility with digital PWM controllers requiring precise current feedback and fault flag signaling.
Technical Context
The UCD74111RVFT implements a two-stage gate driver architecture: one high-side driver with bootstrap (BOOT/SW) operation and one low-side driver referenced to PGND, both supporting independent or synchronous mode via SRE_MD configuration. Its current sensing path uses switched-capacitor differential amplification (CSP/CSN) with 50.2 V/V gain and 0.5-V offset, delivering a voltage-proportional IMON signal.
Fault protection includes three independent detection blocks: high-side overcurrent (HS_SNS comparator with programmable blanking via RDLY), DCR-based output overcurrent (ILIM threshold comparison against IMON), and thermal shutdown at 155–175°C. UVLO on VGG (4.4 V turn-on, 4.1 V turn-off) ensures safe startup, while tri-state detection on PWM (1.65 V ±0.85 V window, 450–750 ns hold-off) enables controller-initiated graceful shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 15-A continuous rating enables direct replacement of discrete driver + MOSFET solutions in DSP/ASIC point-of-load designs. |
| Input Voltage Range | 4.7 V to 14 V supports wide-input industrial and telecom DC-DC converters without external LDO pre-regulation. |
| Switching Frequency | Up to 2 MHz operation allows compact magnetics and high transient response in space-constrained modules. |
| Current Sensing | DCR-based differential amplifier (CSP/CSN) with 50.2× gain and 0.5-V offset yields IMON = 0.5 V + 50.2×(VCSP−VCSN) for accurate load current monitoring. |
| Thermal Protection | Integrated thermal shutdown triggers at 155–175°C rising threshold with 20°C hysteresis, preventing irreversible junction damage during overload or airflow loss. |
| Package | 40-pin PQFN (RVF), 5 mm × 7 mm, with exposed thermal pad tied to PGND-enables ≤28.9°C/W junction-to-ambient thermal resistance in standard PCB layouts. |
| Gate Drive Supply | On-chip VGG regulator delivers 5.3–6.8 V (at 50 mA) from VIN; externally disableable via VGG_DIS for systems using dedicated gate bias rails. |
Pinout & Package
The UCD74111RVFT is housed in a thermally enhanced 40-pin PQFN (RVF) package measuring 5 mm × 7 mm, featuring an exposed thermal pad electrically connected to PGND for efficient heat dissipation in high-power-density applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND | Analog ground reference | Return for all analog circuits except low-side gate driver; must be star-connected to PGND near AGND pin to avoid noise coupling. |
| VIN (Pins 21–26) | High-side power input | Connects directly to input bus; multiple pins reduce resistance and inductance for high-current paths. |
| PGND (Pins 13–20, 22–25) | Power ground return | Low-inductance return path for low-side FET and gate driver; ties internally to thermal pad for thermal conduction. |
| SW | Switching node | Connection point between high- and low-side FETs; requires careful layout to minimize ringing; serves as bootstrap capacitor return. |
| BOOT | Bootstrap supply | Drives high-side gate via external 0.22 µF ceramic capacitor to SW; internal diode charges capacitor during low-side conduction. |
| PWM | Digital control input | 3.3 V/5 V compatible Schmitt-triggered input; detects tri-state (1.65 V ±0.85 V) to force both gates OFF without controller intervention. |
| SRE / SRE_MD | Mode and enable control | SRE_MD selects synchronous (PWM controls both FETs) or independent (PWM=HS, SRE=LS) mode; SRE enables/disables low-side rectifier in synchronous mode. |
| CSP / CSN | Differential current sense inputs | Accept DCR or shunt-based sensing; 100 kΩ input impedance and 5.3 V common-mode range support noisy buck converter environments. |
| IMON | Current monitor output | Analog voltage proportional to load current: 0.5 V at zero load, rising 50.2 mV per 1 mV across CSP–CSN; usable range 0.1–3.3 V. |
| FLT | Fault flag output | Open-drain 3.3 V logic output asserting high on overcurrent, overtemperature, or VGG UVLO; resets automatically after fault clears and next PWM falling edge. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated NexFET™ Power Stage | Combines high-side (6.5 mΩ RDS(on)) and low-side (2.7 mΩ RDS(on)) MOSFETs with matched gate drivers-eliminates discrete layout complexity and parasitic mismatch. |
| Programmable High-Side Blanking | RDLY pin sources 90 µA to set blanking time (110–140 ns) for HS_SNS comparator, preventing false overcurrent trips during switching edge transitions. |
| Tri-State PWM Detection | Internal 50 kΩ pull-up/pull-down resistors detect high-impedance controller states; holds both gates OFF within 750 ns to prevent uncontrolled shoot-through during reset or sleep. |
| VGG Regulator Flexibility | On-chip linear regulator delivers 6.4 V nominal gate drive; disableable via VGG_DIS to accept external 4.6–6.5 V supply-supports multi-rail systems with shared gate bias rails. |
| Adaptive Anti-Cross-Conduction | In synchronous mode, monitors HS_SNS voltage to verify high-side FET turn-off before enabling low-side drive-ensures dead-time compliance without external timing components. |
Applications
| Telecom POL Module | DSP/ASIC Core Supply |
|---|---|
Use Scenario: Point-of-load regulation for 48 V intermediate bus in 5G baseband units requiring fast transient response and telemetry. IC Role / Device Role / Timing Role: Primary synchronous buck power stage delivering 1.2 V @ 15 A with IMON feedback to digital controller for adaptive voltage scaling. Use Value: Integrated current sensing eliminates external op-amp and ADC, reducing BOM count by 4 components while maintaining ±3% current measurement accuracy. | Use Scenario: Core voltage supply for high-performance digital signal processors in radar processing subsystems. IC Role / Device Role / Timing Role: High-efficiency buck stage operating at 1.5 MHz with thermal shutdown protecting against junction overheating during burst-mode compute loads. Use Value: 28.9°C/W θJA and exposed thermal pad enable >12 W dissipation without heatsink, simplifying mechanical design in sealed enclosures. |
| Networking DC-DC Converter | Industrial FPGA Power Management |
Use Scenario: Compact 12 V input to 3.3 V/10 A output converter for switch fabric ASICs in enterprise routers. IC Role / Device Role / Timing Role: Synchronous buck stage with SRE-controlled low-side disable for pre-bias start-up into existing rail voltages. Use Value: SRE pin functionality allows controlled soft-start into pre-biased outputs, eliminating inrush current spikes that could disrupt adjacent circuitry. | Use Scenario: Reconfigurable power delivery for Xilinx Kintex Ultrascale+ FPGAs requiring dynamic VCCINT scaling across process corners. IC Role / Device Role / Timing Role: Current-sensing buck stage feeding IMON signal to FPGA's analog monitoring block for real-time thermal derating. Use Value: IMON output provides direct 0.5–3.3 V analog representation of FPGA core current, enabling closed-loop thermal management without external current shunts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck power stage applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5140RHH | Single-chip controller + integrated high-side FET only; requires external low-side MOSFET and current sense amplifier. | Lacks integrated current monitor output (IMON) and fault flag (FLT); needs external circuitry for current telemetry and protection signaling. | Select when system-level flexibility outweighs integration benefits-e.g., when optimizing for cost-sensitive, lower-current (<10 A) designs with custom layout constraints. |
| TPS53679RTAR | Multi-phase controller with integrated drivers but no power MOSFETs; supports up to 60 A with external NexFETs. | Requires external DCR sensing network and separate fault reporting logic; no monolithic IMON output or built-in thermal shutdown. | Choose for higher-current, multi-phase applications where phase interleaving and advanced loop compensation are required beyond single-stage capability. |
Compared with LM5140RHH and TPS53679RTAR, the UCD74111RVFT provides full power stage integration-including matched MOSFETs, gate drivers, current sensing, and fault signaling-in a single 5 mm × 7 mm package, reducing total solution size by ≥40% and eliminating 7+ external components typically needed for protection and telemetry.
Availability
UCD74111RVFT is available at Aetrix Electronics and suitable for telecom POL modules, DSP/ASIC core supplies, and high-power-density DC-DC converters requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production ramp.
Supply support for UCD74111RVFT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-efficiency power conversion ICs.
The UCD74111RVFT belongs to TI's UCD digital power ecosystem, designed specifically to serve as a high-current, intelligent power stage companion for digital PWM controllers like the UCD92xx family-enabling precise current telemetry, autonomous fault response, and seamless system-level power management.
FAQ
What is the maximum continuous output current supported by the UCD74111RVFT?
The UCD74111RVFT supports 15-A continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). This rating assumes use of the 5 mm × 7 mm PQFN package with adequate copper pour and thermal vias to the internal PGND plane. Peak current capability exceeds 30 A for short durations, limited by IOCH specification and thermal constraints.
How does the UCD74111RVFT implement current sensing without a physical shunt resistor?
The UCD74111RVFT supports DCR (DC resistance) current sensing via CSP and CSN pins, using the inductor's inherent winding resistance as the sense element. With appropriate RC network across the inductor (L/DCR = RC), the capacitor voltage replicates the DCR voltage drop. The internal amplifier then converts this differential signal to a single-ended IMON output with 50.2× gain and 0.5-V offset-enabling accurate current monitoring without added power loss or board area.
Can the UCD74111RVFT operate with an external gate drive voltage instead of the internal VGG regulator?
Yes, the UCD74111RVFT supports external gate drive voltage via the VGG pin. To enable this mode, assert VGG_DIS high (to BP3) and supply 4.6–6.5 V to VGG through a 4.7-µF low-ESR ceramic capacitor to PGND. The internal VGG regulator is disabled, and UVLO monitoring continues on the VGG pin itself. This configuration is useful in systems with shared, regulated gate bias rails or where tighter VGG tolerance is required than the internal regulator provides.
What is the function of the RDLY pin on the UCD74111RVFT, and how is it configured?
The RDLY pin on the UCD74111RVFT sets the blanking time for the high-side current sense comparator (HS_SNS). It sources a constant 90 µA current, so connecting a resistor RRDLY from RDLY to AGND establishes tBLANK = 0.693 × RRDLY × CHS_SNS. With RRDLY = 8.06 kΩ, blanking time is 110–140 ns-sufficient to suppress switching-edge noise while preserving fast overcurrent response. Values between 5.00 kΩ and 25.00 kΩ are supported per datasheet.
Does the UCD74111RVFT provide automatic protection against shoot-through during switching transitions?
Yes, the UCD74111RVFT provides adaptive anti-cross-conduction protection in synchronous mode (SRE_MD = high). It monitors the HS_SNS voltage to confirm high-side FET turn-off before enabling the low-side gate drive. This hardware-enforced dead-time eliminates reliance on controller-generated delays and prevents shoot-through even under rapid load transients or timing skew. In independent mode (SRE_MD = low), this logic is disabled and shoot-through prevention becomes the system designer's responsibility.
UCD74111RVFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 40-PowerLFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- -
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.7V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 15A
- Frequency - Switching:
- Up to 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-LQFN-CLIP (7x5)
UCD74111RVFT FAQ
1.How can I place an order for UCD74111RVFT through Aetrix?
Please submit a Request for Quotation (RFQ) for UCD74111RVFT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for UCD74111RVFT reliable?
The price and inventory of UCD74111RVFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCD74111RVFT is usually 5 days.
3.What payment methods are accepted for UCD74111RVFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCD74111RVFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCD74111RVFT?
UCD74111RVFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCD74111RVFT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for UCD74111RVFT?
For technical support, including UCD74111RVFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCD74111RVFT requirements.
6.How does Aetrix verify that UCD74111RVFT is sourced from the original manufacturer or authorized distributors?
All UCD74111RVFT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UCD74111RVFT meets industry standards.
7.What is the process for return or replacement of UCD74111RVFT?
All UCD74111RVFT units undergo pre-shipment inspection (PSI). If there is an issue with UCD74111RVFT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The UCD74111RVFT part is unused and in its original packaging.
Return procedure for UCD74111RVFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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